Upgrade the Rust toolchain to 1.99.1 (#61205)

## What changed

- Update the workspace, Bazel toolchain and lockfile, CI and release workflows, and Windows setup script from Rust `1.95.0` to `1.99.1`.
- Adapt Rust code to the updated toolchain and Clippy lints, including `try_update` for atomics, `as_chunks` for fixed-size slices, and targeted allowances for generated tonic services.
- Refresh the halfwidth sound mark rendering snapshot to use literal characters in debug output.

GitOrigin-RevId: 5852029f687436dc814c2bca68141ee1f4a67d49

codex-rs/shell-command/src/bash.rs

@@ -88,11 +88,8 @@ pub fn try_parse_word_only_commands_sequence(tree: &Tree, src: &str) -> Option<V
 
     let mut commands = Vec::new();
     for node in command_nodes {
-        if let Some(words) = parse_plain_command_from_node(node, src) {
-            commands.push(words);
-        } else {
-            return None;
-        }
+        let words = parse_plain_command_from_node(node, src)?;
+        commands.push(words);
     }
     Some(commands)
 }